The Hino SG3325 headlight bulb specifications include an H4651 size for high beam and H4656 size for low beam applications. The replacement chart covers vehicle production years spanning 1998 to 2004 with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino SG3325 uses the H4651 bulb size for the high beam headlight across all listed model years from 1998-2004.
The low beam headlight on the Hino SG3325 uses the H4656 across the same 1998-2004 model year span.
Both the H4651 and H4656 are ANSI-standardized sealed beam units recognized in the United States and Canada, meaning they conform to a defined set of photometric and dimensional standards rather than being proprietary designs.
Each unit is a 4x6-inch rectangular sealed beam, a format in which the lens, reflector, and filament are fused into a single glass assembly.
Because both types are sealed beam units, the entire assembly is replaced rather than an individual filament or bulb element inside it.
The H4651 and H4656 are both rated at 12 volts, consistent with standard automotive electrical systems.
Although the H4651 and H4656 share the same 4x6-inch rectangular sealed beam format and voltage rating, they are not interchangeable, as the two part numbers designate distinct beam patterns, with H4651 designated for high beam use and H4656 for low beam use.